Zombie army game idea

General theme idea- players recruit a zombie army and compare its strength at the end.

General mechanics- light drafting, set collection card game.

Any thoughts on how cards consisting of various zombies can be collected and their strengths compared at the end? One idea is Knizia "most least" (think Tigris or Samurai) scoring where players diversify and try to collect the most sets but this seems kind of boring.

I'd like to keep it all cards but am open to something puzzly involving collecting tiles instead and players creating their own zombie army in front on them & comparing it to other player zombie formations at the end of the game.